Evaporative cooler pump



P 8, 1959 E. T. MASSINGILL 2,902,939

. EVAPORATIVE COOLER PUMP Filed May 9, 195a ELTON TI MASS/NG/LLINVENTOR.

A TTORNEY United States Paten EVAPORATIV E COOLER PUMP Elton T.Massingill, Fort Worth, Tex., assignor to Lennox industries, Inc.,Marshalltown, Iowa, a corporation of owa Application May 9, 1958, SerialNo. 734,298

1 Claim. (Cl. 103-87) This invention relates to pumps and has referenceto partially submerged units such as those used in the tanks ofevaporator Window coolers.

More particularly, the invention is directed to pumping units wherein acentrifugal pump having a vertical axis is located beneath a liquidlevel and is driven by a motor positioned thereabove. While theinvention is not limited to a particular use, the class of pumpsreferred to are generally employed when recirculating relatively smallvolumes of water, for example, in window coolers where water is raisedfrom a tank through a tube to a perforated distributor pipe over anevaporator pad or the like. The water then trickles downwardly throughthe pad, Where it is aerated, and thence returns to the tank.Ordinarily, tap water is used for this purpose, but it is well knownthat such water frequently includes corrosive elements due to unfilteredimpurities and chemical content.

An object of the invention is to provide a pump unit of the describedclass which will more effectively resist corrosion and thereby reducerepairs and replacements.

A particular object of the invention is to provide a simplifiedconstruction which may be quickly and economically assembled.

A further object of the invention is to provide a centrifugal pumphousing which may be conveniently opened and closed, when necessary, bymeans of a single locking ring.

These and other objects will become apparent from the followingdescription of the accompanying drawings, wherein:

Figure l is an elevational view of a pump unit embodying the features ofthe invention.

Figure 2 is an enlarged vertical broken sectional view of the lowerportion of the pump unit and particularly showing the centrifugal pumpincluding the base, pump housing, impeller, removable bottom and lockingring holding the latter in place.

Figure 3 is a bottom plan view, shown partly in broken section, andillustrating the housing bottom and locking ring in assembled position.

The form of the invention shown is generally comprised of a circularbase 10, a vertical hollow cylindrical body 11 mounted thereon, and amotor 12 mounted on the upper end of the body. As shown in Figure 1,integral ears 13 on the upper outer surface of the body 11 are providedfor securing the motor in place.

As shown in Figure 2, the base includes a pump housing 14 which encasesan impeller 15, the latter being mounted on the lower end of adownwardly extending motor shaft 16. Immediately below the housing 14the base includes an enlarged circular cavity 17 for receiving adisk-shaped housing bottom 18 which fits against a shoulder 19 betweensaid cavity and said hous- Patented Sept. 8, 1959 ice ing. A groove 20is formed around the wall of the cavity 17 for receiving a locking ring21, preferably of stainless steel. Similarly, the depending motor shaft16 is preferably of stainless steel, but may be coated with a syntheticresin or other non-corrosive protective material, such as paint orlacquer.

The base 10, housing bottom 18 and body 11 are of moldable syntheticresin, preferably of the polyamide group and it has been found thatpolyethylenes are particularly suitable since they are not subject tocracking due to sharp blows or sudden temperature changes.

Other details of the pump shown include slotted integral lugs 22 on theupper surface of the pump housing 14 for receiving portions of the lowerperiphery of the body 11, inlet port 23 in the lower wall of said body,and a housing inlet 24 which is an enlarged circular opening in saidhousing around the motor shaft 16. There is a tangential discharge port25 in the side of the housing 14.

The impeller 15 shown may be stamped from a single sheet of metal,preferably of non-corrosive metal such as stainless steel, or may be ofmolded non-corrosive material. In the event the impeller 15 is molded ofnon-metallic material, the hub thereof (not numbered) would berelatively thick so as to resist flexing and breaking.

It is to be noted that the base 10 is relatively wide as compared withthe height of the unit; accordingly, for most purposes, it is notrequired that the base be secured to the bottom of the tank in which theunit operates. It is also pointed out that the assembly of the diskhousing bottom is capable of quick and convenient installation, and thatthe unit as a whole will resist corrosion due to chemicals found inwater ordinarily used in evaporative coolers.

The invention is not limited to the exemplary construction herein shownand described, but may be varied within the scope of the appended claim.

What is claimed is:

A pump comprising a horizontal base, a vertical cylindrical hollow bodythereabove, a motor mounted on the upper end of said body and having theaxis thereof in axial alignment with the axial center of said body, acircular pump housing in said base and a circular cavity in said basebeneath said housing, the diameter of said cavity being larger than thediameter of said housing providing the shoulder therebetween, adisk-shaped housing bottom positioned against said shoulder, a groove inWall of said circular cavity, a locking ring in said groove and bearingagainst the lower surface of said disk-shaped housing bottom, animpeller within said pump housing, a vertical shaft connecting saidmotor with said impeller, slotted integral lugs on the upper surface ofsaid pump housing receiving portions of the lower periphery of saidbody, inlet ports in said body between said lugs, a circular inlet insaid housing around said shaft, and a tangential discharge port in thevertical wall of said pump housing.

References Cited in the file of this patent UNITED STATES PATENTS2,098,621 Gollnick Nov. 9, 1937 2,701,529 Finzel Feb. 8, 1955 2,747,513Atkinson May 29, 1956 2,782,720 Dochterman Feb. 26, 1957 2,791,182Scheidl May 7, 1957 2,884,863 Hartmann May 5, 1959

